It is your last for loop that has unbalanced curly brackets, Your open curly bracket is on line 146, the if statement has balanced ones, and the closing curly bracket on line 155 you would think it's from the Void bullets_Click function, but you did not close the curly bracket for the for loop.

Yes, they do help you. If you adopted a sensible indentation style, you would find it much easier to see where you've missed out a closing brace. It also helps you see the flow of control through your code much more easily.

Not only does their advice help you find the problem you're currently having, it will help you not make similar mistakes in future, and when you do, it will help you find them.